This example sets the asyncronous timer to 7 seconds. After this time, it posts a message to an event semaphore.
#define INCL_DOSSEMAPHORES /* Semaphore values */ #define INCL_DOSDATETIME /* Timer support */ #define INCL_DOSERRORS /* DOS error values */ #include <os2.h> #include <stdio.h> int main(VOID) { PSZ szSemName = "\\SEM32\\TIMER\\THREAD1\\EVENT1"; /* Semaphore name */ HEV hevEvent1 = 0; /* Event semaphore handle */ HTIMER htimerEvent1 = 0; /* Timer handle */ APIRET rc = NO_ERROR; /* Return code */ rc = DosCreateEventSem(szSemName, /* Name of semaphore to create */ &hevEvent1, /* Handle of semaphore returned */ DC_SEM_SHARED, /* Shared semaphore */ FALSE); /* Semaphore is in RESET state */ if (rc != NO_ERROR) { printf("DosCreateEventSem error: return code = %u\n", rc); return 1; } rc = DosAsyncTimer(7000L, /* 7 second interval */ (HSEM) hevEvent1, /* Semaphore to post */ &htimerEvent1); /* Timer handler (returned) */ if (rc != NO_ERROR) { printf("DosAsyncTimer error: return code = %u\n", rc); return 1; } else { printf("Timer will expire in about 7 seconds...\n"); } /* ... add your other processing here... */ rc = DosWaitEventSem(hevEvent1, /* Wait for AsyncTimer event */ (ULONG) SEM_INDEFINITE_WAIT); /* As long as it takes */ if (rc != NO_ERROR) { printf("DosWaitEventSem error: return code = %u\n", rc); return 1; } rc = DosCloseEventSem(hevEvent1); /* Get rid of semaphore */ if (rc != NO_ERROR) { printf("DosCloseEventSem error: return code = %u", rc); return 1; } return NO_ERROR; }